2018
DOI: 10.1088/1367-2630/aac0c6
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Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

Abstract: The present status of kinetic modeling of particle dynamics in hydrogen negative ion (H − ) source plasmas and their comparisons with experiments are reviewed and discussed with some new results. The main focus is placed on the following topics, which are important for the research and development of H − sources for intense and high-quality H − ion beams: (i) effects of non-equilibrium features of electron energy distribution function on volume and surface H − production, (ii) the origin of the spatial non-uni… Show more

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Cited by 22 publications
(20 citation statements)
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“…Although the meniscus formation is a key to the beam focusing, it is extremely difficult to observe the meniscus experimentally. In numerical simulations, it is pointed out that the meniscus shape is important for the beam halo generation and the beam divergence [25][26][27]. A similar result was also reported by the inverse beam calculation to evaluate the meniscus shape [28].…”
Section: Introductionsupporting
confidence: 64%
“…Although the meniscus formation is a key to the beam focusing, it is extremely difficult to observe the meniscus experimentally. In numerical simulations, it is pointed out that the meniscus shape is important for the beam halo generation and the beam divergence [25][26][27]. A similar result was also reported by the inverse beam calculation to evaluate the meniscus shape [28].…”
Section: Introductionsupporting
confidence: 64%
“…Many other authors [63][64][65][66][67] have developed similar approaches for a better understanding of the formation of negative H − and D − in different sources.…”
Section: Global Models and Relevant Elementary Processes In Caesium-free Nis: Early Studiesmentioning
confidence: 99%
“…Contrary to surface production sources, volume production sources operate with pure H 2 or D 2 , having the practical advantage of inherently caesium-free operation, which makes them an attractive alternative. While different processes might be responsible for the formation of negative ions [67,73,74,103], the volume production mechanism is an efficient path and mainly refers to the process of dissociative attachment (DA) of low-energy (cold) electrons to highly vibrationally excited molecules [19,66,73,103]:…”
Section: Prometheus Reactor At Patras Universitymentioning
confidence: 99%
“…The combination of physics modelling and simulation with experimental methods is the key to improved understanding of NBI's hydrogen and deuterium plasma; Hatayama presents a thorough review of the low temperature plasma modelling [21] and Tsumori presents the most sophisticated measurement techniques to investigate plasma population's properties including those specific to large sources for fusion reactors' NBI heating [22]. As an example, Briefi applied a collisional radiative modelling to analyse high-density low temperature hydrogen plasma; he presents the simulation of inductively coupled plasma (ICP) heating of CERN's Linac4 ion source and its experimental validation via state-of-the-art optical emission spectroscopy measurements of the Balmer lines and Fulcher band [23].…”
Section: Negative Ion Source Beam Intensities Across 20 Orders Of Magmentioning
confidence: 99%